Automation System
A disadvantage of Numerical Control (NC) is:

the machine tool can easily overheat
the tape and tape reader are not reliable
the computer is not reliable
None of these
one operator is needed for each machine.

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Automation System
Pressure sensors:

use an aneroid chamber with a variable resistance output
use capacitive variations to sense pressure
None of these
use the piezoresistive effect in strain gauge sensors
All of these

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Automation System
Programmable controllers:

are programmed using relay ladder logic
cannot perform functions other than relay logic
None of these
(a) and (c) above
are widely used in many different industries

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